The ESP-01 is the perfect tool for one specific job: Turning "dumb" serial devices into smart devices.
If you’ve been in the IoT hobbyist space for more than five minutes, you’ve likely seen the tiny, unassuming blue board called the ESP-01 . It’s the gateway drug to Wi-Fi-enabled projects, often costing less than a cup of coffee. esp-01 datasheet
| Mode | GPIO 0 | GPIO 2 | GPIO 15 (TXD) | | :--- | :--- | :--- | :--- | | | LOW | HIGH | LOW | | Flash Boot (Run Code) | HIGH | HIGH | LOW | The ESP-01 is the perfect tool for one
Pro Tip: Keep a PDF of the ESP8266EX Technical Reference Manual on your desktop. You won't read all of it, but you will search for "Deep Sleep" and "GPIO" a thousand times. | Mode | GPIO 0 | GPIO 2
It’s a finicky, low-pin-count, voltage-sensitive pain in the neck. But when you finally get that "Hello World" printed over Wi-Fi from a board the size of a postage stamp, you’ll understand why this little blue module became a legend.
But trying to use an ESP-01 without consulting its datasheet is like trying to fly a drone in the dark. You might get it off the ground, but you’re going to crash.